
% Table created by stargazer v.5.2.2 by Marek Hlavac, Harvard University. E-mail: hlavac at fas.harvard.edu
% Date and time: Mon, Jun 17, 2024 - 8:10:19 PM
 \begin{table}[!htbp] \centering 
  \caption{Testing for Heterogeneity by Baseline Exposure Level} 
  \label{tab:nonlin0405} 
\begin{threeparttable}
\begin{tabular}{@{\extracolsep{5pt}}lccc} 
\toprule
 \multicolumn{4}{l}{\textbf{Outcome:} Standardized Test Scores} \\ 
\\[-1.8ex] & (1) & (2) & (3)  \\ 
\midrule
\multicolumn{4}{l}{Testing for Non-Linearity in PM2.5 by Above vs.\ Below Median} \\ \\
 PM2.5  & $-$0.0124$^{**}$ & $-$0.0167$^{**}$ & $-$0.0146$^{**}$ \\ 
\footnotesize{($\mu$g/m$^3$)}   & (0.0060) & (0.0069) & (0.0077)\\  
  & & & \\ 
High*PM2.5 & $-$0.0026 & $-$0.0014 & $-$0.0013 \\ 
  & (0.0030) & (0.0031) & (0.0029) \\ [\bigskipamount]
Observations & 604,288 & 604,288 & 604,288 \\ 
Adjusted R$^{2}$ & 0.851 & 0.851 & 0.851 \\
   %& & & \\ 
\midrule

\hline \\[-1.8ex] 
\textbf{Controls Used:} \\ 
Student Covariates & Yes & Yes & Yes  \\
Local Economic Controls & No & Yes & Yes \\
Weather Controls & No & No & Yes  \\ \\
[-1.8ex]
\thickline
\end{tabular} 
\hline \\[-1.8ex] 
\textit{Note:}  & \multicolumn{3}{r}{$^{*}$p$<$0.1; $^{**}$p$<$0.05; $^{***}$p$<$0.01} \\ 

\end{table} 
